This is my problem:

An industrial-organizational psychologist is using Fisbees Mental Measure to predict worker
productivity on an assembly line. She collects a representative sample of manufacturing employees
and tests them with the Fisbee, and also obtains their scores on a measurement of productivity.
The Fisbee has a variance of 72.25. A previous reliability study found that the covariance between
two parallel forms of the Fisbee was 58.5225. In current sample, Fisbees Mental Measure has a
mean of 150, and covaries 5.7375 with productivity. The productivity variable has a mean of 5
and a variance of 2.25. The reliability estimate is 0.8. Assuming that productivity is measured without error, obtain a
disattenuated (corrected for measurement error) validity coefficient for Fisbees Mental Measure.